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  • A WDM-PON with an 80 Gb/s capacity based on

    wavelength-locked Fabry-Perot laser diode

    Hoon-Keun Lee, 1 Ho-Sung Cho,

    2 Joon-Young Kim,

    1 and Chang-Hee Lee

    1,*

    1Division of Electrical Engineering, Korea Advanced Institute of Science and Technology, 373-1, Guseong-dong,

    Yuseong-gu, Daejeon, 305-701, Korea 2Eldis Inc. 958-3, Daechon-dong, Buk-gu, GwangJu, 500-706, Korea

    *changheelee@kaist.edu

    Abstract: We investigate a high capacity WDM-PON based on

    wavelength-locked Fabry-Perot laser diodes. A color-free transmission of

    2.5 Gb/s per channel is achieved with a polarization independent F-P LD

    and a decision threshold control circuit at the receiver. Then, we

    demonstrate an 80 Gb/s capacity (2.5 Gb/s × 32 channels) WDM-PON with

    transmission length of 20 km. We also investigate impairments in

    transmission.

    ©2010 Optical Society of America

    OCIS codes: (060.4510) Optical communications; (060.4250) Networks.

    References and links

    1. C.-H. Lee, W. V. Sorin, and B. Y. Kim, “Fiber to the Home using a PON Infrastructure,” J. Lightwave Technol.

    24(12), 4568–4583 (2006).

    2. C.-H. Lee, S.-M. Lee, K.-M. Choi, J.-H. Moon, S.-G. Mun, K.-T. Jeong, J. H. Kim, and B. Kim, “WDM-PON

    experiences in Korea [Invited],” J. Opt. Netw. 6(5), 451–464 (2007).

    3. S.-G. Mun, J.-H. Moon, H.-K. Lee, J.-Y. Kim, and C.-H. Lee, “A WDM-PON with a 40 Gb/s (32 x 1.25 Gb/s)

    capacity based on wavelength-locked Fabry-Perot laser diodes,” Opt. Express 16(15), 11361–11368 (2008).

    4. J. S. Jeong, and C.-H. Lee, “Optical Noise Suppression Techniques for Wavelength-Locked Fabry-Perot Laser

    Diode,” in Proceedings of the 15th Asia-Pacific Conference on Communications (Shanghai, China, 2009), Paper

    142.

    5. A. D. McCoy, P. Horak, B. C. Thomsen, M. Ibsen, and D. J. Richardson, “Noise Suppression of Incoherent Light

    Using a Gain-Saturated SOA: Implications for Spectrum-Sliced WDM Systems,” J. Lightwave Technol. 23(8),

    2399–2409 (2005).

    6. A. Shen, D. Make, F. Poingt, L. Legouezigou, F. Pommereau, O. Legouezigou, J. Landreau, B. Rousseau, F.

    Lelarge, and G.-H. Daun, “Polarisation insensitive injection locked Fabry-Perot laser diodes for 2.5Gb/s WDM

    access applications,” in Proceedings of the European Conference and Exhibition on Optical Communication

    (Brussels, Belgium, 2008), Paper Th.3.D.1.

    7. H.-S. Kim, B.-S. Choi, K.-S. Kim, D. C. Kim, O.-K. Kwon, and D.-K. Oh, “Multisection RSOA for 2.5 Gbps

    Colorless WDM-PON,” in Proceedings of the European Conference and Exhibition on Optical Communication

    (Vienna, Austria, 2009), Paper P2.17.

    8. J.-H. Moon, K.-M. Choi, S.-G. Mun, and C.-H. Lee, “Effects of Back-Reflection in WDM-PONs Based on Seed

    Light Injection,” IEEE Photon. Technol. Lett. 19(24), 2045–2047 (2007).

    9. H.-K. Lee, J.-H. Moon, S.-G. Mun, K.-M. Choi, and C.-H. Lee, “Decision Threshold Control Method for the

    Optical Receiver of a WDM-PON,” J. Opt. Commun. Netw. 2(6), 381–388 (2010).

    10. J. C. Palais, Fiber Optic Communications, 5th ed. (Pearson Prentice-Hall, 2005), Chap. 11.

    11. W. Lee, M. Y. Park, S. H. Cho, J. Lee, C. Kim, G. Jeong, and B. W. Kim, “Bidirectional WDM-PON Based on

    Gain-Saturated Reflective Semiconductor Optical Amplifiers,” IEEE Photon. Technol. Lett. 17(11), 2460–2462

    (2005).

    12. A. D. McCoy, B. C. Thomsen, M. Ibsen, and D. J. Richardson, “Filtering Effects in a Spectrum-Sliced WDM

    System Using SOA-based Noise Reduction,” IEEE Photon. Technol. Lett. 16(2), 680–682 (2004).

    13. S.-H. Cho, H.-H. Lee, M.-Y. Park, J.-H. Lee, J.-H. Yu, and B. Kim, “Effects of RSOA Gain Ripples on Upstream

    Transmission in a SML-Seeded Loop-Back WDM-PON,” in Proceedings of the Optical Fiber Communication

    Conference (San Diego, CA, 2009), Paper JWA70.

    14. K.-Y. Park, and C.-H. Lee, “Intensity Noise in a Wavelength-Locked Fabry-Perot Laser Diode to a Spectrum

    Sliced ASE,” IEEE J. Quantum Electron. 44(3), 209–215 (2008).

    15. J.-Y. Kim, S.-G. Mun, J.-H. Moon, H.-K. Lee, and C.-H. Lee, “A High Capacity and Long Reach DWDM-PON

    Using Triple-Contact F-P LDs,” in Proceedings of the Optical Fiber Communication Conference (San Diego,

    CA, 2010), Paper JThA31.

    #130891 - $15.00 USD Received 29 Jun 2010; revised 29 Jul 2010; accepted 30 Jul 2010; published 6 Aug 2010 (C) 2010 OSA 16 August 2010 / Vol. 18, No. 17 / OPTICS EXPRESS 18077

  • 16. K. H. Han, E. S. Son, H. Y. Choi, K. W. Lim, and Y. C. Chung, “Bidirectional WDM PON Using Light-Emitting

    Diodes Spectrum-Sliced With Cyclic Arrayed-Waveguide Grating,” IEEE Photon. Technol. Lett. 16(10), 2380–

    2382 (2004).

    1. Introduction

    Recently, bandwidth requirements for subscribers are explosively increased with growth of

    video-centric services such as Internet Protocol Television (IPTV), High Definition Television

    (HDTV), 3-D TV. To accommodate these bandwidth intensive services in access network, a

    wavelength division multiplexing passive optical network (WDM-PON) has been attracted

    considerable attention because of its large bandwidth, high security, and protocol transparency

    [1]. A WDM-PON based on wavelength-locked Fabry-Perot laser diodes (F-P LDs) was

    proposed and it has been already commercialized [2]. The wavelength-locked F-P LD is

    attractive because of its cost-effective color-free (or colorless) feature. However, the high-

    speed transmission (> 2.5 Gb/s per channel) is limited by the optical beat noises (or intensity

    noises) resulting from the injected spectrum-sliced amplified spontaneous emission (ASE)

    light [3]. This beat noise can be reduced by increasing the spectrum-sliced ASE bandwidth

    and/or noise suppression technique [4]. However, increase of ASE bandwidth reduces number

    of transmission channels and increases dispersion penalty. The noise suppression scheme

    makes the WDM-PON architecture complicated and imposes an additional cost on the

    subscribers. Moreover, it brings about dispersion induced de-correlation penalty [4,5]. The

    beat noise can be also reduced by injecting a coherent seed light instead of the incoherent

    (ASE) seed light. So far, 2.5 Gb/s transmission has been demonstrated with a coherent seeded

    light injection to polarization independent (PI) F-P LDs [6]/reflective semiconductor optical

    amplifiers (RSOAs) [7]. However, optical back reflection induced impairments are hurdles for

    a low cost and high performance system [8].

    In this paper, we present 2.5 Gb/s operation for the WDM-PON based on the wavelength-

    locked F-P LD at 100 GHz channel spacing with ASE seeding. The intensity noise was

    reduced by a factor of 2 with a PI F-P LD. It enables 2.5 Gb/s per channel WDM-PON with

    help of decision threshold control. We also demonstrate a WDM-PON with an 80-Gb/s

    capacity over a conventional C band. The dominant system impairment after transmission was

    dispersion induced de-correlation of intensity noise suppressed light.

    2. Considerations for 2.5 Gb/s transmission

    2.1 RIN requirement

    The ultimate performance of the WDM-PON based on wavelength-locked F-P LD is limited

    by the relative intensity noise (RIN) resulting from the spectrum slicing of the broadband seed

    light [3,9]. Assuming a RIN value is x )0(< dB/Hz, the RIN-induced noise power can be

    given by [10]

    2 2 2 1010 x

    RIN e R P Bσ = ⋅ ⋅ ⋅ (1)

    where, R is the receiver responsivity, P is the optical received power and eB is the electrical

    bandwidth of the receiver. For 1.25 Gb/s data rate, the required RIN level was around −110

    dB/Hz for error-free transmission [9]. It may be noted that we need to set the decision

    threshold level of the optical receiver near the optimum value. When a broadband light source

    (BLS) such as a PI ASE light was spectrum-sliced by a 100 GHz flat-top type arrayed

    waveguide grating (AWG), the measured RIN was about −110 dB/Hz. Thus we have to

    suppress the RIN level more than 3 dB for 2.5 Gb/s transmission at 100 GHz channel spacing

    [10]. A gain saturation characteristic in an F-P LD [4] or an RSOA [11] can be used for the

    noise suppression. However, in WDM-PON, the noise suppressed signal is degraded after

    #130891 - $15.00 USD Received 29 Jun 2010; revised 29 Jul 2010; accepted 30 Jul 2010; published 6 Aug 2010 (C) 2010 OSA 16 August 2010 / Vol. 18, No. 17 / OPTICS EXPRESS 18078

  • passing through the 2 AWGs located at the central office (CO) and remote node (RN). This is

    so called optical filtering effect [12].

    2.2 Dispersion and phase de-correlation effects

    Beside of RIN requirement in the previous Section, we need to consider dispersion induced

    penalty for high speed data transmission. The dispersion penalty will be much serious in

    transmission of a high speed spectrum-sliced ASE signal, since the spectral width is

    comparable to the bandwidth of the filter (AWG) used for the spectrum slicing. The

    dispersion penalty can be reduced by reducing the filter bandwidth. However, the RIN

    increases as we decrease the bandwidth. Thus we have to suppress the RIN for a high speed

    WDM-PON with a